A user with GUID “ccd83bc42-1bff-459e-9db2-558cc68478b9” has more than 500 open folders in a single session, because exchange only allows 500 open folder connections (for a cached mailed) at a time its going to screw with the user and in our case not automatically update the users folders in Outlook 2010. Please note this is different from open MAPI connections to the mailbox.

Note this has been edited with help from Mark Daley who stated:

the objtfolder is an ‘Open Item Limit’ ie the limit of the number of folders that are being opened in a single session, not the number of connections being made to the mailbox which is a session limit See (http://technet.microsoft.com/en-us/library/ff477612(v=exchg.141).aspx). This limit is the total for the session so if a user has 250 folders in their own mailbox and say 300 in a shared mailbox then the limit will be breached. The other thing that should be explained in that this is only likely to occur when the mailboxes are cached (shared and non-shared) as it is the consequence of caching that is causing the limit to be breached because each folder is opened / counted during the mailbox sync process. Therefore turning off caching mode for either the primary mailbox or just the shared mailbox is another fix for this issue.

You may be wondering how a user could have more than 500 connections, well in our case the user had two mailboxes attached to their own mailbox and all the folders (inbox, outbox etc) together added up to more than 500 folders.

You can scan a mailbox with Power Shell to determine the number of folders:

I had a replace a PC for a user today who’s email was hosted externally.

So after I replaced the PC I came to setup Outlook, checked the old PC and saw the following setup:

What on earth is

iC Exchange I think to myself!! Check the config:

What are these settings, I’ve never seen the like before!!!

So what do I do?!? Well the Server must be accessible from the internet so after a bit of playing the server was accessible from http://mail.EXCHAGESERVER.co.uk and using some provided credentials I could logon!!

Once I logged on I realised I wasn’t looking at Exchange I was look at VMware Zimbra!! I’ve never heard of this and watching the promotional video they said Exchange was legacy so I immediately decided they were stupid!!

Well reading about I found I needed a Outlook connector which I could download from any server running VMware Zimbra!!

We’re in the very slow processes of consolidating domains at work. We’re going from three domains across three sites to one gigantic domain…. Fun fun fun.

As we used to use some awful hosted Exchange 2003 platform we decided the first thing to be moved was Exchange…. So as all the users were on a separate domain we created a lavish Exchange 2010 platform and used linked mailboxes for everyone and migrated the mail!! Think I posted on how we did this earlier…basically created the linked mailboxes via PowerShell and a CSV file then ExMerge the mail out of Exchange 2003 and used a PowerShell import command to pull the mail in (although you could use new PST Capture tool now to import which provides a pretty GUI).

So here we are, linked mailboxes as far as the eye can see, full of crappy mail!

Next we setup Auto Discover on all our domains to point to exchange and bobs your uncle.

So, everyone is working away…and suddenly people start complaining they keep getting prompted for their username and password credentials in Outlook 2010 running Windows 7!

Ok I think, you’d expect it once or twice due to going cross domain but not 20 or 30 times!!

The Fix, after trying everything we discovered it was down to AutoDiscover and it not being routed internally!

Added it (it being AutoDiscover.Domain.com) to the proxy exclusion list in IE and wham! No more prompts!

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